Question

alguemmmmn me ajuda?​

Answer 1

a) Q1 e Q3 essa é a resposta

Answer 2

Basta aplicar a lei de Coulomb :

F = k × $\frac{Q . Q}{d^{2} }$

A)

F = k × $\frac{Q1 . Q3}{d^{2} }$

F = $9.10^{9}$ × $\frac{7.10^{-6} . 10 . 10^{-6} }{(0,3)^{2} }$

F = $9.10^{9}$ × $\frac{70.10^{-12} }{0,09}$

F = $\frac{630 . 10^{-3} }{0,09}$

F = $\frac{0,63}{0,09}$

F = 7 N

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B)

F = k × $\frac{Q1 . Q4}{d^{2} }$

F = $9.10^{9}$ × $\frac{7.10^{-6} . 2.10^{-6} }{(0,5)^{2} }$

F = $9.10^{9}$ × $\frac{14.10^{-12} }{0,25}$

F = $\frac{126.10^{-3} }{0,25}$

F = $\frac{0,126}{0,25}$

F = 0,504 N

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C)

F = K × $\frac{Q3 . Q4}{d^{2} }$

F = $9.10^{9}$ × $\frac{10.10^{-6} . 2.10^{-6} }{(0,4)^{2} }$

F = $9.10^{9}$ × $\frac{20.10^{-12} }{0,16}$

F = $\frac{180.10^{-3} }{0,16}$  

F = $\frac{0,18}{0,16}$

F = 1,125 N